I notice from your log that there's more than 1 Antivirus installed. McAfee and Avast
Never install more than one Antivirus and Firewall! Rather than giving you extra protection, it will decrease the reliability of it seriously!
The reason for this is that if both products have their automatic (Real-Time) protection switched on, your system may lock up due to both software products attempting to access the same file at the same time.
Also because more than one Antivirus and Firewall installed are not compatible with eachother, it can cause system performance problems and a serious system slowdown.
So you have to make a decision here and keep the Antivirus you prefer and uninstall the other one.
Then reboot after uninstalling.
I actually can't see anything suspicious in your log, so it would be a great idea to give more explanation what exact problem you are having.
Also, * Please visit this webpage for instructions for downloading and running ComboFix:http://www.bleepingcomputer.com/combofix/how-to-use-combofix
Post the log from ComboFix in your next reply.